Stabil-trak™ system – Lull 944E-42 Service Manual User Manual

Page 230

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Stabil-TRAK™ System

10-18

944E-42

10.5.7

Hydraulic Troubleshooting - Free Pivot Mode, Base Oil Out

MU4261

Front

2

3

4

5

6

8

9

1

7

Legend

1. Stabilizer Cylinder
2. Solenoid 12A
3. Solenoid 12B
4. Pressure Reducing Cartridge
5. Solenoid 4A
6. Solenoid 4B
7. Solenoid 3
8. Check Valve 2A
9. Check Valve 2B

Conditions:

• Ignition ON, engine

running

• Boom angle is

below 40°

• Travel select lever in

(F) FORWARD or
(R) REVERSE

• Park brake ON

• Service brake

DISENGAGED

With boom below 40°, when frame

swaying to the left, the right front tire

comes off the ground.

Check electrical wiring.

Check solenoid coils 12A and 12B on the

Stabil-TRAK™ manifold for correct

resistance (7-9 ohms).

Replace solenoid(s).

Remove solenoid cartridges 12A and 12B

from Stabil-TRAK™ manifold and inspect

for debris or damage. Refer to Section

8.8, “Hydraulic Cylinders.”

Clean passages or replace cartridge(s).

Replace check valve(s).

Inspect check valves on frame sway

cylinder. Refer to Section 8.8, “Hydraulic

Cylinders.”

Replace check valve(s).

Inspect check valves 2A and 2B on the

stabilizer cylinder. Refer to Section 8.8,

“Hydraulic Cylinders.”

Not

OK

Not

OK

Not

OK

Not

OK

Not

OK

If OK

If OK

If OK

If OK

Refer to Stabil-TRAK™ Electrical

Circuit Operation and Troubleshooting

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